Effects of adjuvants and temperature on glyphosate absorption by cultured cells of velvetleaf (<i>Abutilon theophrasti</i> Medic.)

Røyneberg, T.; Balke, Nelson E.; Lund‐Höie, K.

doi:10.1111/j.1365-3180.1992.tb01903.x

Cited by 17 publications

(14 citation statements)

References 22 publications

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“…Temperature also influenced 14 C-glyphosate absorption by cultured velvetleaf cells (Røyneberg et al 1992). Nearly twice as much glyphosate was absorbed at 28 C than at 16 or 4 C. Similar temperature effects were observed with bermudagrass [Cynodon dactylon (L.) Pers.]…”

Section: Introductionmentioning

confidence: 63%

Glyphosate Efficacy on Velvetleaf Varies with Application Time of Day

Waltz

Martin²,

Roeth³

et al. 2004

Weed technol.

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Field and growth chamber experiments determined the efficacy of temporal glyphosate applications on velvetleaf. Glyphosate was applied postemergence to velvetleaf periodically before and during light and after dark. In 1999, glyphosate at 840 g ae/ha applied before sunrise and after midday provided 54 and 100% velvetleaf control, respectively. In 2000, glyphosate at 840 g/ha applied before sunrise, midday, and after sunset provided 69, 100, and 37% velvetleaf control, respectively. In the growth chamber, glyphosate at 840 g/ha applied before or after light reduced velvetleaf biomass 15 to 20% or 32 to 47%, respectively, and reduced velvetleaf height 24% or 45 to 54%, respectively. Velvetleaf control was consistently greater with glyphosate applications during light compared with dark, regardless of constant air temperature and relative humidity (growth chamber), dew absence or presence (field and growth chamber), or leaf blade orientation (growth chamber) with natural light-dark movements or a fixed horizontal position.

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Section: Introductionmentioning

confidence: 63%

Glyphosate Efficacy on Velvetleaf Varies with Application Time of Day

Waltz

Martin²,

Roeth³

et al. 2004

Weed technol.

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“…The formulation of a herbicide, particularly the adjuvant systems, can have a profound influence on the efficiency of herbicide delivery to the target plant, as well as uptake across the cuticle, translocation within the plant, and consequently, biological performance (Gaskin and Holloway 1992). An adjuvant can also alter the permeability of the plasmalemma or change the physicochemical properties of the herbicide, which could lead to increased cellular uptake and concomitantly increased phytotoxicity (Royneberg et al 1992). Glyphosate is formulated in a number of ways, and phytotoxicity is influenced by the type of surfactant and the salt (Hatzios and Penner 1985).…”

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confidence: 99%

Influence of formulation and glyphosate salt on absorption and translocation in three annual weeds

Smeda

Sellers

et al. 2005

Weed Science

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Absorption and translocation of three commercial formulations of glyphosate, the isopropylamine salt formulated as Roundup Ultra™ (IPA1) and Roundup UltraMax™ (IPA2) and the diammonium salt formulated as Touchdown™ IQ (DA), were compared in three- to five-leaf velvetleaf, common waterhemp, and pitted morningglory. Absorption of 14C-glyphosate in velvetleaf was not significantly different among the three formulations up to 50 h after treatment (HAT). More absorption of 14C-glyphosate occurred in the IPA1 (26.0%) vs. the IPA2 (17.7%) formulation over 74 h. Of the total 14C-glyphosate absorbed, 20 to 35% was translocated from the treated leaf to the rest of the plant. Initial absorption of 14C-glyphosate was rapid in common waterhemp with the IPA1 (42.7%) and IPA2 (30.7%) formulations; both were higher compared with absorption of the DA formulation (11.5%) by 2 HAT. These differences continued up to 26 HAT, but no differences were evident by 74 HAT. Up to 65% of the 14C-glyphosate absorbed was translocated out of the treated leaf by 74 HAT, with roots the primary sink. Initial absorption of 14C-glyphosate was slow in pitted morningglory compared with the other species. More foliar absorption occurred in plants treated with the DA (13.6%) vs. the IPA2 formulation (4.9%) by 6 HAT. Absorption beyond 26 HAT was not different among the three glyphosate formulations. Translocation of 14C-glyphosate to roots was 27% greater as the DA salt than IPA1 and IPA2 by 74 HAT. The distribution pattern of glyphosate was similar in all species; phosphorimages demonstrated movement both acropetal and basipetal, with accumulation in roots greater than in any other plant parts. An efficacy study parallel to the 14C study showed no difference among the three glyphosate formulations on the species investigated at both 74 HAT and 2 wk after treatment.

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“…Cationic polyoxyethylene tertiary amine surfactants are more effective than nonionic surfactants at promoting glyphosate phytotoxicity (Wyrill and Bumside, 1977;Riechers, 1992). Although several studies have examined surfactant mode of action in promoting glyphosate phytotoxicity (O'Donovan et al, 1985;Sherrick et al, 1986aSherrick et al, , 1986bde Ruiter et al, 1988;Gaskin and Holloway, 1992;Rdyneberg et al, 1992;Stock et al, 1992), the precise mechanism(s) of surfactant interaction has not been deduced. Surfactants promoting greatest glyphosate phytotoxicity are required at higher concentrations than necessary for maximum reduction of the spray solution surface tension, indicating that their mode of action is not limited to increasing the spreading characteristics of the spray droplet (Sherrick et al, 1986b).…”

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confidence: 99%